Web content filters (aka Proxies) in a transparent mode deployment that are not performing TLS interception would not be able to monitor these queries if wrapped in TLS.
However, an explicit mode deployment and all 80/443 traffic enforced by an egress firewall through the proxy that was performing TLS interception can still monitor this traffic. In fact, even if you’re not brokering TLS, the GET method described can still leak the query (but not response) unless your client uses tunneling (ie. CONNECT method).
ISPs can’t force you to use an explicit proxy, but corporations can.